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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.accessibilityservice.util;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.StringRes;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.util.TypedValue;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
/**
* Collection of utilities for accessibility service.
*
* @hide
*/
public final class AccessibilityUtils {
private AccessibilityUtils() {}
// Used for html description of accessibility service. The <img> src tag must follow the
// prefix rule. e.g. <img src="R.drawable.fileName"/>
private static final String IMG_PREFIX = "R.drawable.";
private static final String ANCHOR_TAG = "a";
private static final List<String> UNSUPPORTED_TAG_LIST = new ArrayList<>(
Collections.singletonList(ANCHOR_TAG));
/**
* Gets the filtered html string for
* {@link android.accessibilityservice.AccessibilityServiceInfo} and
* {@link android.accessibilityservice.AccessibilityShortcutInfo}. It filters
* the <img> tag which do not meet the custom specification and the <a> tag.
*
* @param text the target text is html format.
* @return the filtered html string.
*/
public static @NonNull String getFilteredHtmlText(@NonNull String text) {
final String replacementStart = "<invalidtag ";
final String replacementEnd = "</invalidtag>";
for (String tag : UNSUPPORTED_TAG_LIST) {
final String regexStart = "(?i)<" + tag + "(\\s+|>)";
final String regexEnd = "(?i)</" + tag + "\\s*>";
text = Pattern.compile(regexStart).matcher(text).replaceAll(replacementStart);
text = Pattern.compile(regexEnd).matcher(text).replaceAll(replacementEnd);
}
final String regexInvalidImgTag = "(?i)<img\\s+(?!src\\s*=\\s*\"(?-i)" + IMG_PREFIX + ")";
text = Pattern.compile(regexInvalidImgTag).matcher(text).replaceAll(
replacementStart);
return text;
}
/**
* Loads the animated image for
* {@link android.accessibilityservice.AccessibilityServiceInfo} and
* {@link android.accessibilityservice.AccessibilityShortcutInfo}. It checks the resource
* whether to exceed the screen size.
*
* @param context the current context.
* @param applicationInfo the current application.
* @param resId the animated image resource id.
* @return the animated image which is safe.
*/
@Nullable
public static Drawable loadSafeAnimatedImage(@NonNull Context context,
@NonNull ApplicationInfo applicationInfo, @StringRes int resId) {
if (resId == /* invalid */ 0) {
return null;
}
final PackageManager packageManager = context.getPackageManager();
final String packageName = applicationInfo.packageName;
final Drawable bannerDrawable = packageManager.getDrawable(packageName, resId,
applicationInfo);
if (bannerDrawable == null) {
return null;
}
final boolean isImageWidthOverScreenLength =
bannerDrawable.getIntrinsicWidth() > getScreenWidthPixels(context);
final boolean isImageHeightOverScreenLength =
bannerDrawable.getIntrinsicHeight() > getScreenHeightPixels(context);
return (isImageWidthOverScreenLength || isImageHeightOverScreenLength)
? null
: bannerDrawable;
}
/**
* Gets the width of the screen.
*
* @param context the current context.
* @return the width of the screen in term of pixels.
*/
private static int getScreenWidthPixels(@NonNull Context context) {
final Resources resources = context.getResources();
final int screenWidthDp = resources.getConfiguration().screenWidthDp;
return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, screenWidthDp,
resources.getDisplayMetrics()));
}
/**
* Gets the height of the screen.
*
* @param context the current context.
* @return the height of the screen in term of pixels.
*/
private static int getScreenHeightPixels(@NonNull Context context) {
final Resources resources = context.getResources();
final int screenHeightDp = resources.getConfiguration().screenHeightDp;
return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, screenHeightDp,
resources.getDisplayMetrics()));
}
}
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